Decimal point indicating mechanism



Sept. 14, 1943. G. c. ELLERBECK DECIMAL POINT INDICATING MECHANISM Filed July 12, 1940 13 Sheets-Sheet 1 www @m B PIE. 1

INVENTOR. GPA/VT C flLEPBECK ATTORNEY.

Sept. 14, 1943. s. c. ELLERBECK DECIMAL POINT INDICATING MECHANISM 1s Sheets-Sheet? Filed July 12, 1940 INVENTOR.

6m-r CZZLEPBECK ATTORNEY p 1943- s. c. ELLVERBECK I 2,329,190

DECIMAL POINT INDICATING MECHANISM Filed July 12, 1940 13 Sheets-Sheet 5 INVENTOR. GPA/VT O fLLEPBEc/r ATTORNEY.

15 Sheets-Sheet 4 M Q3 Q2 RQ m Sept. 1-4, 1943. G. c, ELLERBECK DECIMAL POINT INDICATING MECHANISM Filed July 12, 1940 INVENTOR. Gem/T 6. ALE/aim ATTORNEY.

Sept. 14, 1943. G. c. ELLERBECK DECIMAL POINT INDICATING MECHANISM Filed July 12, 1940 15 Sheets-Sheet 5 INVENTOR. GAANT C flLmscck ATTORNEY.

Sept. 14, 1943. cs. c. ELLERBECK DECIMAL POINT INDICATING MECHANISM Filedml 12, 1940 13 Sheets-Sheet e 2024 m I FIE 51D- INVENTOR. GPA/VT C [ZLEEBECK VW/W A TTORNE Y Sept. 14, 1943. G. c. ELLERBECK DECIMAL POINT INDICATING MECHANISM Filed July 12, 1940 13 Sheets-Sheet '7 INVENTOR Gu/vr C [l-LERBECK w? m @w ATTORNEY.

Sept. 14, 1943. cs. c. ELLERBECK 2,329,190 DECIMAL POINT INDICATING MECHANISM Filed Ju1y 12, 1940 15 sheets-sheet a.

INVENTOR GPANT C [LLEPBECK ATTORNEY.

Sept. 14, 1943. s. c. ELLERBECK 2,329,190

DECIMAL POINT INDICATING MECHANISM Filed July 12, 1940 13 Sheets-Sheet 9 FIEJE- INVENTOR. GPA/VT C. ELLEPBECK ATTORNEY.

Sept. 14, 1943. e. c. ELLERBECK DECIMAL POINT INDICATING MECHANISM Filed July 12, 1940 15 Sheets-Sheet 10 INVENTOR. GPANT C [LLEABECK A TTORNE Y.

Sept. 14, 1943. a. c. ELLERBECK 2,329,190

DECIMAL POINT INDICATING MECHANISM Filed July 12, 1940 13 SheetsSheet 11 INVENTOR. GPA/VT C. fumazck ATTORNEY.

Sept. 14, 1943.

G. C. ELLERBECK DECIMAL POINT INDICATING MECHANISM Filed July 12, 1940 13 SheetsSheet 12 .157 1&5

Big 6/8 3 I34? 0 I 7/ INVENTOR.

GEANT 6. [ZLERBECK Sept. 14, 1943. G. c. ELLERBECK 2,329,190

DECIMAL POINT INDICATING MECHANISM Filed July 12, 1940 15 Sheets-Sheet 1s 'INVENTOR.

FIE E E5- GPA/V7 C. fZLEPBECK TM/W- ATTORNEY.

UNITED STATES PATENT OFFICE 2,329,190 DECIMAL POINT mmoa'rnvo MECHANISM Grant C. Ellerbeck, Long Beach, Calif., assignor to Marchant Calculating Machine Company, a corporation of California Application July 12, 1940,;Serial No. 345,116

32 Claims.

This invention relates to calculating machines and has particular reference to mechanism for automatically indicating the position of decimal points of factors and resultsci a calcula tion on a calculating machine, such as the multi pller and the product in multiplication calculatlon.

Heretofore, the position of the decimal point in the product of a multiplication has usually been found by mentally adding the number of pointed oil decimal places of the multiplier and multiplicand, and then indicatin the position of the decimal point in the product b moving a decimal pointer or indicator along the product register to point oil a number of places equal to the sum thus ascertained. This not only entails extra manipulation and mental effort on the part of the operator, but also frequently introduces errors.

The principal object of the present invention is to automatically determine and indicate the position of the decimal point in a product registered in a product register of a calculating machine.

Another object of the invention is to eliminate extra manipulation for the purpose of controlling setting 01' the multiplier decimal point indicator.

Another object of the invention is to provide I manually operable devices for controlling setting of the decimal point indicator of the multiplier and product registers, which will be rendered ineffective after a single operation in any calcula- I tlon.

A further and more specific object of the invention is the provision of mechanism whereby the setting of the multiplier and product decimal point indicators may be controlled by manually operable devices used to control the operation of the machine in multiplication.

Another object of the invention is to provide an improved decimal point indicating mechanism which will be set by power derived from the motor during machine operation, under control of manually set devices.

Another object of the invention is the provision patent reference is had for a complete disclosure not specifically disclosed herein. However, modifications, the invention is equally applicable to other calculating machines.

The manner in which the above and other objects of the invention are accomplished will be readily understood on reference to the following specification when read in conjunction with the accompanying drawings, wherein:

Figure l is a plan view of a calculating machine embodying the present invention and showing the location of the various control devices including the decimal multiplier keys.

Figure 2 is a longitudinal sectional viewed from the right side of the machine emhodying the present invention.

Figure 3 is a fragmentary sectional view illustrating the camming bar and its relation to the various decimal setting slides, and is taken along the line 3-3 of Figure 2.

Figure 4 is a. fragmentary sectional view i1lustrating the yleldable means for holding each of the decimal sleeves in either of their alternate of the calculating machine, including mechanism positions.

Figure 5 is a developed plan view, partly in section, and with parts broken away, of calculating machine.

Figure 6 is a longitudinal sectional view, taken from the right side of the machine, illustrating the multiplier unit and multiplier decimal control mechanism.

Figure 7 is a transverse sectional view through the multiplier key section, and is taken along the line 1--1 of Figure 6.

Figure 8 is a longitudinal sectional view of the multiplier unit, illustrating the manner in which selection may be made of a multiplier value,

Figure 9 is a sectional detail view showing mechanism for automatically controlling the ter mination of a multiplication operation.

Figur 10 is a detail of the lost motion connection between the gear 2020 and cam 2024.

Figures 11 and 12 illustrate details of the com struction of certain oi the levers'illustrated in Figure 6.

Figure 13 is a sectional plan view taken substantially on line l3--|3 of Figure 9.

Figure 14 is a longitudinal sectional view illustratlng the zero multiplier key and the carriage shift control mechanism associated therewith.

Figure 15 illustrates the means controlled by the zero multiplier key and the carriage shifting mechanism for delaying operation of the setting bar.

g'urc i is a view, looking from the right side e machine, with parts in section, illustrating ecimnlsiu for clearing the accumulator and counter registers, as well as decimal indicating mechanism.

Figure l? is a side elevational view of part of mechanism to: controlling operation of the clutch. rigure is a. schematic view showing the various units and their relationship to the driving motor.

Figure 19 is a s ctional elevational view showthe carriage mechanism.

r igure 20 is a fragmentary view illustrating the lost motion latch operating means for the shift mechanism.

Figure 21 is a sectional elevational view showing certain of the mechanism utilized for effect- ;oower'shift of the carriage and controls or; gure 22 is a transverse sectional view through shift transmission, the construction onnection to the carriage.

sectional view taken along the FigureZB, illustrating a modified .er control key.

and 24.

-.ner indicated by the character and amount other factor of the calculation.

I The mechanism for setting up the first factor h be considered as comprising a manually operated and a power portion, the manually opero d. portion being designed to be moved to a steel controlling position by the depression one the power operated portion being o to be brought into operation by control and to operate the various calculating control of the manually set red in Figure l, the various value selectare arranged in a series of banks C upon the magnitude of the factor with machine is designed to deal. Each comprises a key frame IOI (Figure 2) stems E63 of the various keys slidably mounted. All of the key stems the sonic and compression mounted on the same to normally keys sat in a raised position. i the value keys is a differeniiifl (Figure 2) which is pivfrom the key section frame IIlI l2! and I29, This s .ai divergent notches ates in a rectangular oned to receive the end of the 4 y stem $63 so that the bar In atei'y positioned thereby. Y stems I03 are spaced an equal dis- Hi this distance is slightly greater acing between successive slots III so that each succeeding slot III will be spaced one increment further away irom Its cooperating key stem; thus, the depression of a value key I00 will cam the bar I20 to the right, as viewed in Figure 2, a number of increments equal to the value represented by the depressed key.

Such movement of each of the bars I20 is utilized to set up a mechanical representation of the selected value to control the calculatin mechanism accordingly, and for this purpose a swing rig segment member I32 is connected by means of a pin and slot connection I53 to each bar I28, and is pivotally connected upon a common shaft I 31 extending across the machine and supporting like members associated with other key banks. A tension spring I64, provided between the segment I32 and a. stud suitably sup ported by the machine frame, normally maintains the segment I32 and bar I20 in'the position illustrated in Figure 2 when all of the keys In the corresponding key bank are released.

Each of the segment members I32 is provided at opposite ends thereof with arcuate racks I38 and I39 which serve to transmit movement of the differential bar I20, respectively, to a pinion I35 connected to a check dial assembly I40 rotatably mounted on a shaft HI, and through a gear I5I to a cam unit I48 which is positioned by such movement to form a mechanical representation of the value set up on the associated key bank.

Rockable decimal markers III (Figures 2 and 5) pd" between each bank of keys, and each marker is journaled at the foremost end in a notch formed in. a bracket strip I04 which is secured by I05 to a cross piece or bar II". The rearniost end of each of the markers H2 is journaled in a notch formed in a second bracket strip I06 suitably secured on top of the various key frames IIII. A finger piece H4 is secured to each marker H3 and extends through a cover member Il5 so that the decimal marker may be rocked to expose either of its sides, the markers being shown in the different positions in Figure 5.

One side of these markers is colored to correspond with the coloring of the top of the channel IIII, while their other side is colored to contrast therewith, so that by turning the selected markers, the keyboard may be set up in any desired manner.

Power set selection mechanism After the setting of the mechanism heretofore described has been completed, and upon manipulation of one of the operation control keys, the power operated portion of the machine is brought into operation and acts under the control of the cam units I46 to eflect entry of a value set up on the keyboard .into the accumulator register. Since this power operated mechanism is illustrated in detail in the above mentioned Avery patent, only a brief description oi the function of this mechanism is deemed necessary.

Each cam unit I48 comprises a gear I5I'and five cams, one oi. which is shown at I52. Each of the cams has two high points I" and two low points IBI on its periphery. The cams are so taggered that no high or low point on one cam is aligned with a high or low point on another cam. The various cams on each cam unit I48 are so arranged that upon depression of a value key IIIO, the gear I5I meshing with the arcuate rack I39, will rotate the cam unit I46 to a position wherein one of the high points of one of the cams will be positioned in the path of a. nose I2II of one of a set of five feeler arms I2I0 on one side of the cam unit I46, or in the path ofa nose I2I9 of one of a set of live feeler arms I2I1 on the opposite side of the unit I46.

Upon depression of one of the various operation control keys, such as one of the multiplication control keys 2002 (Figures 1 and '7), a setting clutch dog 394 (Figure 17) i rocked by suitable mechanism to effect engagement of a cyclically operable setting clutch 430, the details of which are also disclosed in the above Avery patent.

Upon engagement of the setting clutch 430,

power derived from a driving motor 640 (Figure 18) is transmitted through a train of elements, including gears 645, 646,- 841, 362, the latter of which is suitably connected to a gear 646 meshing with a gear 430, through the setting clutch 430 to a setting shaft 43I. v

Keyed on the setting shaft, 43I are a number of pairs of complementary cams identical to earns I220 and I22I (Figure 2), and each said pair has an associated cam follower I224 pivoted on a cross rod I225 and provided ,with a roller I222 in engagement with the cam I220 and a second roller I223 in engagement with the cam I22I. As the shaft 43I rotates, the cam followers I224 are rocked in a clockwise direction and, through links I226, impart a counter-clckwise rocking movement to a series of levers I2|4 rockably mounted on a shaft I2I5. A shaft I2I3, supported by the levers I2I4, has pivotally mounted thereon the groups of feeler arms !2 I0 hereinbefo're described, one of these groups being located adjacent the cam units I46. During the leftward movement of the feeler arm I2I0 by the shaft I2I3, each of the noses I2II formed on the feeler arms I2I0 en gages th periphery of its associated'cam on the cam unit I46, thereby causing each feeler arm I2l0 to pivot about the point of contact between its respective nose and the periphery of its associated cam. The balance of the forward movement of the shaft I 2I3 by the cam follower I224 effects forward movement of the lower end of the feeler arm I 2I0, and this movement is transmitted through a link I2 I 6 to rocka second feeler arm I!" aligned with each of the feeler arms.

I2I0. The arms I2I1 rock in a clockwise direcs tlon about a fixed shaft I2I8 until theirnoses I2I9 engage th periphery of the respective cam at a point substantially diametrically opposite that engaged by the nose I2II of the associated feeler arm I2 I 0.

As was described hereinbefore, each of the cam units I46 is so arranged that only one of the associated pairs of feeler arms |2I0 and I2l1 will have its respective noses in engagement with the high and low points of a cam at any one setting of the value keys I00 in the respective key sectlon. Thus, one of the feeler arms I2I0 will be rocked a considerable angle about its supporting and I13, the former meshing with a laminated gear I69 mounted on the sleeve I69.

, From the above it will be seen that four of each group of five of the selection plates I12 will be held in a medial position substantially as shown. in Figure 2, while the fifth will be moved forward or rearward until the lowermost gear I13 thereof meshes, for example, with an aligned gear I15 on a shaft I66, or an aligned gear I16 on a shaft I61.

Gear I15 is one of a group of four gears I11 (Figure 18), keyed on the shaft I66, and adapted to mesh with'gears on four of the selection plates I12. Likewise, the gear I16 forms one of a group of five years I18 mounted on the shaft I 61 and adapted to mesh with gears on the five selection plates I12. The three leftmost gears of this latter group are keyed to the shaft I61, while the two rightmost gears I88 and I99 are free on the shaft I61 and mesh with gears I95 and200, re spectively, keyed on a third shaft I68.

The shafts I66, I61, and I68 are connected the motor 640 (Figure 18) in a manner described hereinafter, so that the shaft I66 rotates through 180 for each cycle of operation of the machine, and the shaft I61 rotates through 90 for ach I cycle of operation of the machine, while the shaft I68 rotates through 30 for each cycle of operation. The diameters of the various gears in the two gear groups I11 and I18 corresponding to each keyboard order, are so arranged that for each machine cycle, the gear I89 (Figure 2) will be rotated by one of the gears of the group I11 and I18, a number of increments corresponding to the value of the key 560 which is depressed during a machine cycle. If no key is depressed, the selection plates !12 will be so arranged that none of the gears of the groups I18 and I11 will become operative to drive the gears I13.

At the start of the machine cycle, and in ad-- Vance of rotation of the gears 689, a gear i2'if; (Figures 2 and 19) having a gear I213 of the accummulatorregister mechanism meshing therewith, is dipped under control of the setting shaft 43 I, by means to be described hereinafter, to mesh L with the gears I89 and thereby transmit rotation shaft I2I3 to one "side or the other of a medial position, depending upon whether its nose I2II is in engagement with a high point I or a lowpolnt I6I of its respective cam. All of the other cams in the cam unit will, since their hoses are held the same distance apart from the camsupto a numeral dial I94 of the accumulator register visible through opening 4 I8 (Figure l) in the carriage cover. Suitable tens carrying mechanism (not shown) is provided as disclosed in detail in the above mentioned Avery patent.

As was mentioned hereinbefore, the various gears on shafts I66, I61, and I68 are adapted .to be driven by the motor 640 (Figure 18) and for this purpose a cyclically operable main clutch, diagrammatically illustrated at 428 (Figures 17 and 18), is provided to control rotation of these shafts. Clutch 428 is entrained with the hereinbefore mentioned drive 362 through a pinion 650 and. a gear 4I5 connected to the driven side of the clutch 428. During each cycle of operation of the clutch 428 (one-half revolution there of), a one-half revolution is transmitted to a shaft 429 and this rotation is, in turn, transmitted through a reversible transmission (not shown), through gears 458 and 484 to the shaft I66. The shaft I66 is entrained with the shaft porting shaft I5 9 by the remaining cam, be held 6 in their respective medial positions, causing their upper slotted ends to attain a position substantially as shown in Figure 2.

Each of the feeler arms IZIO is connected to a pin and slot connection I206 with a plate I12 pivoted on a sleeve I69 journaled on a shaft I10, and arranged on each plate is a set of gears I14 I61 through gears 485, 486, and 481, while the shaft I68 is entrained with the shaft I61 through I gears 488 and 489.

I Initiation of operation of the main clutch 428 is controlled by the setting clutch 430, and for this purpose a cam 141 (Figure 17) is keyed on the setting shaft 43I and engages a roller 416 carried by a cam follower 146 plvotally mounted and urged into engagement with i by a tension spring I48. After the as .i'eeler a ms i210 and I2i1, and the selecilil nave been positioned under concoinplementary cam I220 and I22I, t e ca engages and rocks the cam follower 1 5 counter-clockwise, enabling a tip 6I5 carried thereby to engage the notch 6I6 formed in a main clutch 395 pivoted on a shaft 6| I, and normally held in engagement with the main clutch through a toggle link arrangement 6H) and tension spring Sit. As the cam follower 146 causes the tip 5i5 to engage and rock the dog 1 s out of en agement with the clutch 428, this clutch couples the shaft 429 with the continuously en gear M5 and thus effects actuation of the one actuator gears I11 and I16.

table (not shown) such as disclosed in clutch cycles during an operation, efore play the multiplier in multipline latter gear being connected to a .34 through suitable tens carry an (not shown).

Carriage dipping .3 the actuating mechanism including the gears by a pair of parallel shafts 253 and 260, h are suitably secured to the carriage and "idle in bearings formed in brackets 251 and respectively, extending from the machine Illlll. To enable such transverse shifting of the carriage, the hereinbefore mentioned ac cumulator register 8 and gears I2'II and I213 connected thereto are normally held in a raised position as illustrated in Figure 2. However, at the start of a machine cycle, and in advance of rotation of the gears I69, the gears I21I are dip n esh with the gears I69 to transmit rotation to the accumulator register. To this end. the accumulator register and gears I21I and i213 are mounted on a series of plates 266 (Figure 19) pivotally supported on a cross rod 262 suitably secured to the carriage 250.

The means for dipping the various plates 266 comprises links 566, slidable at their upper ends over pins 561, and connected at their lower ends to earn follower levers 510 by means of pivot pin Levers 510 have rollers 513 rotatably mounted thereon and extending in an engage- I sit th cams 514 secured on the setting shaft ..hus, the links 566 are positively pulled operation of the setting clutch action of tension spring 569 connected its 566 and studs suitably secured chin-c framework. Each link 566 is th roliers 568 between which is guided secured to the various plates ng of the accumulator regist a position of the carriage 250 the stationar portion of the frame. 3 a means (not shown) is provided for the links 566 in their lowermost position end of one or more machine cycles as determined by the type of calculation being perl and in order to prevent the carriage this.

orn such latching means, a cam 596 is This cam is engaged by a cam follower arm 591 pinned to a rockable shaft 600 which has a series of arms 593 also pinned thereto and connected by pin and slot connections 602 to the various links 566. The cam 595 is rotated by a restore clutch diagrammatically illustrated at 1110 (Figures 18 and 19) which is engaged by movement of the main clutch do: 335 (Figure 17) to clutch disengaging position by suitable means such as is disclosed in detail in the above Avery patent.

Carriage shifting mechanism As is shown in Figure 22, the hereinbefore mentioned motor driven gears 362 and 640 are rotatably mounted on the shaft I306, the latter gear being mounted on flange I301 which is keyed to the hub of the gear 362. Gear 646 has secured thereto a dished supporting disc I303, to which i welded an internal gear I3I5. Gear I3I6 is in mesh with three equi-spaced planetary gear! I3 l6 (Figures 21 and 22) riveted to each of three shafts I3I'I. These. three shafts extend through clearance holes provided in a ratchet wheel I303, and have and bearings in plates I3I6 and III. These plates and the ratchet wheel I303 are secured together as a rigid unit by studs "03a. The planetary gears I3I6 also mesh with a sun gear I320 formed at one end of a sleeve I32I to the opposite end of which is suitably keyed a second ratchet wheel I306. Both the sleeve I32I and the ratchet wheel I305 are journaled on the shaft I306.

Gear teeth 1322 are formed on each shaft I3I1 and these mesh with a second sun gear I321 to which is secured a gear I324, meshing with a gear I326 which is rotatably mounted on a shaft I33Iw This latter gear is held between a pair of friction discs I330 and I332 which are keyed to the shaft I33I. A compression spring I331 is provided to press the discs I330 and I332 against the gear I326. Interposed between the compression spring I331 and the friction disc I322 are a disc I335 splined to shaft I33I, a sleeve I333, a second disc I362 also splined to the shaft in a bearing I340 and in a second bearing I344 supported by a bearing bracket I343. A bevel gear I34I, secured on the shaft I33I, meshes with a second bevel gear I342 fixed on the lower end of a vertical shaft 344. This shaft is Journaled in bearings provided in brackets 350 and I343, and has fixed at the upper end thereof a hub and plate assembly 356 on which are mounted rollers 351 adapted to engage between the teeth of a rack 355, which is suitably mounted on the carriage 250. Thus, upon rotation of the assembly 356 by the planetary transmission mechanism, the rollers 351 will engage between the teeth of the rack 355 and shift the carriage 250 laterally either to the left or to the right, depending upon the direction of rotation of the shaft 334.

The shaft I33I may be selectively rotated in either direction to effect a shift of the carriage 250 either to the light or to the left, by holding one or the other of the ratchet wheels I303 and I305 from rotation. If the ratchet wheel I303 is held, rotation of the planetary gears I3I6 about the sun gear I320 will be prevented and the planetary gears will function as idlers to transmit rotation from the internal gear I3I5, driven by the gear 302 through their integrally connected gears I322 to the sun gear I321, whereby the gear I324 will be rotated in one direction. However, when the other ratchet wheel I305 is held, thereby holding stationary the gear I320 integrally attached thereto, the rotation of internal gear I3I 5 will feed the planetary gears I3I6 about the fixed sun gear I320 with which they mesh, causing them to rotate on their own centers and also to rotate about the sun gear I320, thereby driving the gears I324 in an opposite direction.

To effect such selective shifting of the carriage, a clutch member I30I (Figure 21) is provided. The member I30I has a pair of dogs I302 and I304 extending therefrom, the former being adapted to engage and hold the ratchet wheel I303 from rotation when the member I30I is rocked in a clockwise direction, as viewed in Figure 21, while the latter dog I304 is adapted to engage and hold the ratchet wheel I305 against rotation when the member I30I is rocked in a counterclockwise direction. If the clutch member I30I is held in a neutral position, as illus-- trated in Figure 21. wherein neither of the dogs I302 andl304 is engaged, the differential merely idles and there is no drive to the shifting mechanism.

Means are provided whereby either of the dogs I302 and i304 is held in engagement with its re spective ratchet wheel during approximately the first three-quarters of a shift cycle to positively insure the completion of any initiated shift, regardless of how soon the control member 301 is urged. toward its neutral position after having once been moved to shift controlling position. On a leftward extension of the clutch control member 1301 (Figure 21) is a laterally extending ear I354 adapted to be engaged with either the top or bottom surfaces of a projection I353 formed on a latch member I350, said latch member being pivotally mounted at I35I and urged for engagement with the ear I354 by a spring I352 (Figures and 21). When the control member I30I is rocked either clockwise or counterclockwise from its neutral illustrated position, the projection I353, normally held in the position shown by the ear I354, will snap into latching position either above or below the ear I354 under tension of the spring I352 and thereby latch the clutch member I30I against return movement into its neutral position until shift has progressed through approximately three-quarters of its clearance cycle, at which time it will be released by the latch member I350.

Provision is made for additionally tensioning the spring I352 during the first portion of the shift cycle, and for this purpose, a centralizer I364 (Figure 21), is utilized, the upper end of spring I352 being attached to the extreme left end thereof. The centralizer I364 is pivotally supported at its right hand end (not shown) and is held in engagement with the two diametrically opposed rollers I362 by the spring I352. When the shaft I33I starts to rotate at the beginning of a shift cycle, one of the rollers I363 carried on the disc I362, which is keyed to the shaft I33i, cams the centralizer I364 upwardly, thereby increasing the tension of the spring I352.

Provision is made for moving the latch member I350 from latching engagement with the clutch member I30I upon completion of approxithereon.

matey three-quarters of the shift cycle. For this purpose, a cam I334 (Figure20) having a pair of diametrically opposed lobes formed thereon, is rotatably mounted on the sleeve I333 and is driven by the disc I335 keyed to the shaft I332 so as to cam a nose I351 formed at the lower end of the latch member I350 at the end of approximately three-quarters of a shift cycle.

To insure the same cyclic time of operation of the clutch member I350 for reverse rotation of the shaft I33I, the disc I335 is provided with two shoulders I360 disposed approximately apart, so that a pin I36I secured on the cam i334 will, upon clockwise rotation of the shaft I33I, be engaged by the shoulder I360 on the opposite sides of the disc I335 (Figure 20) only after the disc has been rotated about threeeighths of a revolution, which is about threequarters of a shift cycle. Thus, although the drive to the carriage shift mechanism is thus terminated at approximately three-quarters cycle position, the shift drive train will. be rotated through the remainder of its by centraiizer I364, which is pressed by the a in I352 against rollers I363 on disc I362. In ad tion to completing the shift cycle, the centralizer I364 also serves to restrain any movement beyond the end of the shift cycle so that the carriage will always come to rest in operating position.

The clutch member I30I is pivotally connected at I3i5 (Figure 21) to a short link 1555 a pair of opposed lugs I5I0 formed thereon. In juxtaposition with link I5I I is a second link I314 having identically shaped lugs I5I0 formed Links i313 and 555i are nected together by a compression spring i512 10 sated over the four lugs I510. liiink i333 otally connected at I315 to a lever I315 rock ably mounted on a stationary shaft I315.

Provision is made for returning the clutch member I30I to its neutral 32o: when not restrained in clutch controlling posi tion by the latch member I350, or by means de scribed hereinafter. This comprises a centralizer I403 which is pivotally mounted on the machine frame at I404. A lug I403a extends laterally from the centralizer I403 into engagement with the lever I315 above the shaft I316. while an ad justable lug I4I1 having an ofiset Hi6 mounted on the lower end of the centrallzer i433 and engages the lever I315 below the shaft I315. A tension spring I400 extends between an ear I400a on the centrallizer and a stud I400?) on the machine frame to urge the centralizer against the lever I315. Thus, the centralizer I403 tends to maintain the lever I315 in a neutral position. inwhich the clutch member I30I will be ineffective, and will return the member into this neutral position automatically upon release of the latch I350. provided the link I314 is not re strained against movement by other shift con trolling mechanism.

Multiplier unit cally effected.

These multiplier keys have their key stems I816 slidably mounted in a key frame I311 (Figures 6, 7, and 8), and each has supported thereby a decimal setting key 2000 to be described in .iiereaiter. Because of the close proximity eys 2000 with the keys 2002, the latter erably provided with concave key tops e dormer are provided with convex tops, in 7, to enable the operator to between the two merely by the sense The key 2002 are each normally held in raised position by a compression spring 18" extending the lower flange of the key frame I31! and a shoulder formed on the key stem "he multiplier key section includes the usual rentially settable bar I20 (Figure 8) which is ly the multiplier keys of the 2 to "9 values to move the selection segment member I32 mounton the shaft 131. The machine being normally conditioned for single cycle operation, no rol of the multiplier selection by the 1 key is necessary. The member I32 is substantially like the same member disclosed in Figure 2, except that it does not have the upper segment 2 i lor setting a check. dial.

3 has been disclosed in connection with the set selection mechanism, the swinging is elf-active to rotate a selec- H152 similar to that described in ction with Figure 2.

unit also includes sensing memil (Figure 8) which, in the same disclosed in connection with the ed power set selection mechanism, e to sense the setting of the present and, when a selection gate 235 is m engagement with the plates H2 by o 40.2 alnauner not described, EHO positions the corresponding the usual manner. The plates H2 l on the shaft H0 and have driven orrner of which meshes with gears 2000 pics 8 and 18).

ously described power set selection mechanism,

one the group of plates H2 may be selecoved to engage its gear 20H carried 1 with gears which, in this case, are carby s'eeves rotatably mounted on the shaft Movement of these gears is utilized rol the number of cycles of operation of clutch 028 and thereby effect a multi n or multiple addition oi any factor set keyboard. driven sleeve rotatably mounted on the d. shaft 186 (Figures 9 and 13) carries 20M, 20M, 20i5, and 2M0 connected thereunit, while the driven sleeve rotatabiy on the quarter-speed shaft I61 carries 2M3, and 2019 connected together as hese gears are mounted on the shafts .'l for the sake of convenience and are nnected thereto. A gear 2020 is also rotatncunted on the shaft I61 but is not conedv to the sleeve carrying the gears 20 i1, 20I8, The ratio of these gears MB to 20l9, gear driving them, is such that m e s. not co ably r they provide selection ratios extending from a "9" multiplier to a 3" multiplier, whereas the gear 2020, as will presently appear, provides in combination with other mechanism, the 2 selection mechanism.

It will be seen from the above that, depending upon the selection which has been made, one of the plates H2 is moved either to the right or to the left, as viewed in Figure 8, to engageone of the gears 2013 to 2020, inclusive. The other plates I12 will remain in their neutral position illustrated in Figure 8.

A single cam 202i (Figures 9 and 13) is attached to the sleeve carrying gears 20H to 2010, inclusive, and, as will presently appear, is adapted to rock a bell crank 2022 universally pivoted on the frame by means of a loose fitting pin and spring connection 2020 so as to disengage the main clutch and stop the machine, as hereinafter described, after the cam member 202! has made a single rotation. Thus, for example, gear 20, which is providing for seven main clutch actuations, and controls multiplication by the value 7, makes one rotation while the main clutch 028 (Figures 17 and 18) is making seven rotations. Since the cam 202i is connected to the gear 20, it will likewise make one rotation, and at the end of this rotation is effective to rock the bell crank 2022.

A double cam member 2023 (Figures 9 and 13) is included in the same unit with gears 20, 2M8, and 2MB, and is effective upon half a revolution roc same bell crank 2022. Thus, for example, gear 20ll is effective to control the the value 4, the main clutch making fou ions. During the four main clutch rotai: gear 20l8 and the member 2023 make but had a revolution. At the end of this hali rotation, the member 2023 is effective to rock the bell crank 2022, Gear 2020, provided for multiplication by the value 2, is connected to a triangular member 2024 (Figures 9, 10, and 13), adapted to cooperate with a roller 2021 on the upwardly extending arm of hell crank 2022. This member is adapted, when gear 2020 is being driven, to rock the bell crank 2022 during the second cycle of main clutch operation.

Depression of any multiplier key from 1 to 9, inclusive, is effective to cause engagement of the setting clutch 430 (Figures 17 and 18), and is also effective to initiate motor operation by suitable means (not shown) such as is disclosed in detail in the above mentioned copending Avery application.

The multiplier unit includes a bar 2030 (Figure 6) which is in a position to be engaged by the stem of any multiplier key 2022 of from "1" to 9 value inclusive, and is mounted for parallel movement by swinging levers 20 pivotally connected to its opposite ends. A spring 2032 is tensioned between an extension of the forward lever 20 and the machine framework (not shown), and urges these levers clockwise, thereby normally maintaining the bar 2030 in a raised position. The levers 2044 carry extensions I900 between which is pivotally connected a stabilizer link IBM. This stabilizer link swings with the bar 2030 to prevent any play in the pivotal connection thereof which might result in other than perfect parallel movement upon depression of the various multiplier keys which contact the bar 2030 at spaced points throughout its length.

The mechanism for causing engagement of the setting clutch, upon depression of any multiplier key from 1 to 9, includes a link 2033 (Figures 6 and 12) which is pivoted at its right hand end to an ear of the bar 2030, and is supported adiacent its left hand end by a link I901 depending from a lever 2034, included in a lever system which comprises levers 2034, 2035, and 2036. The levers 2034 and 2035, as shown in detail in Figures l1 and 12, are pivotally mounted upon a common pin 2031 supported by the depending portion of the key frame. The lever 2036 is pivoted at I906 to the lever 2035. Levers 2034 and 2035 include, respectively, projections 2038 and 2039 between which a spring 2040 is compressed to urge the levers apart. Similarly, lever 2036 includes a projection 204i, while 2035 includes a projection 2042 between which projections a spring 2043 is compressed. A lug 2045 on lever 2035 limits the movement of lever 2036 and a lug 2II6 on lever 2035 limits the movement of lever 2035 with respect thereto. Lever 2035 also includes anear 2046 which rides beneath the bar 2030 and which is forced downwardly when the bar 2030 is depressed upon operation of a multiplier key. Depression of the multiplier key (Figures 6, 14, and also rocks lever 2035 downwardly by means of a lever 2090 which underlies the zero key stem, being pivoted at 209i, and carries a pin 2093 overlying the left end of the lever 2035. 2

Operation of the setting clutch 430 is placed under joint control of the bar 2030 and the mechanism for latching a multiplier key in depressed position. To this end, the setting clutch is'engaged by lowering one end of the link 2033 by means of the bar 2030, and the other end of this link b" the hey latching mechanism to be described presently. The link 2033 underlies an car 2049 formed on one arm of a. lever 200"! which is pivoted at I909 and urged counter clockwise about its pivot by a tension spring I956. The lever 2041 has a rearwardly extending arm I 950 provided with a slot I95I which embraces a pin carried by a floating interponent I952 supported at one end thereof b a link I953 which is freely pivoted on a stud I945 supported by the machine framework.

When the link 2033 is lowered to its full extent, it permits the lever 2041 to be pulled counterclockwise by its spring I956, raising the interponent I952 to a position wherein it may be enwhenever the motor circuit is closed. I

The ratchet I951 will thereupon kick the interponent I952 sharply to the left (as viewed in Figure 6), so that its opposite end strikes a stud I058 on a lever I959. The lever I959 is keyed to a shaft 50I to which the setting clutch dog 394 (Figure 17) is also keyed, so that such rocking of this lever will free the dog from the setting clutch and automatically cause engagement thereof.

Upon depression of the parallel bar 2030 by any of the multiplier keys 1" to 9, the lever 2035 having an ear 2046 (Figures 6 and 11) underlying bar 2030 is also rocked by this movement and compression spring 2040 rocking lever 2034 slightly and causing the lug 2062 to engage a notch 2092 in a key latching bar 2055 slidably mounted on the under surface of the key frame I811 to move the bar to the left until a slot formed therekey being depressed is moved below the latch. bar 2055, spring 2040 is permitted to expand, rocking lever 2034 to simultaneously bring the latch bar over the lug I5 and lower the left end of link 2033 which is connected thereto by link I901. Both'ends of the link 2033 now being lowered, lever 2041 may be rocked sumciently by it spring I956 to cause engagement of the setting clutch. The latch bar 2055 holds the depressed key down and all the other keys up until it is retracted to the right, as viewed in Figures 6 and 8.

In order to effect the release of the locked multiplier keys it is necessary to provide means which will be operated uponoperation of either the setting clutchshaft 43I or the carriage shifting mechanism (Figure 22) to retract the latch bar 2055. In view of the fact that the operator may depress a second key before the machine has completed the operation initiated by the first key depressed, and may be pressing down on a third key before the second is released. special adaptation of the latch bar operating means o the peculiar requirements of such. operation necessary.

Retraction of the bar 2055 to unlock the key is effected by a lever 2058 (Figure 6) pivotally mounted at 2059 and adapted to receive a clockwise oscillaticn upon operation of either the setting clutch or the carriage shifting mechanism.

As the setting clutch shaft 43I (Figure 17) re "ceives a half rotation at the commencement of the multiplication operation. a cam l4? fixed thereon rocks the cam follower I46 journaled for rocking movement shaft 508, and which is; fixed an arm 2060 (Figure 6). Thus' ear 2099 engages an ear 2032 on the lever 3050 to the same. During each carriage shifting operation, as will hereinafter appear, a lever I396 (Figure 6 receives a counter-clockwise oscillation. and this lever is provided with an arm i390 adapted to engage a second car I399 on lever 2058.

Adjacent the upper end of lever 2058 there is pivoted thereto an extension 2054 having a 1aterally formed portion engaging a notch in the latch bar 2055. A spring 2058a, compressed between the lever 2058 and the extension 2054, normally holds the extension against the stop 2058b formed on the lever so that the lever and its extension ordinarily function as a unit. However, if lever 2058 receives an excessive stroke the forward end of the slot in latch bar 2055 will be brought against the key stem and spring 2058a will then yield. A spring I960 normally urges the lever 2058 clockwise and prevents the latch bar 2055 from drifting into latching position.

Means are also provided for preventing the locking of a key in depressed position in the event it'is held down until after the releasing mechanism as described above has functioned. Lever 2036 (Figures 6 and 11) pivoted to lever 2035 at I905 is provided with an ear 206i adapted to engage in a notch 2051 in bar 2055 as the latter is moved to the right by lever 2058, and to restrain the bar from returning to key latching position so-long as the key is held depressed, It will be recalled that lever 2035 is rocked counter-clock wise about its pivot 2031 by downward movement of the parallel bar 2030 and this movement thereof is transmitted through spring 2043 to lever It will be observed that' should the operator pressing down upon a locked up multiplier 2002, it would depress during the instant whe notch 2051 is being moved the slight extra nic- 

